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Thanks. I've got some eBay rechargeables that look a bit like the Moon ones. I'll try them. I don't trust them to stay on though so they're more of a back-up than a main light. I might try the bodge option with those classic materials you mention! (edit I did the TCR in 2016 with my main back light mounted on a bit of cork so am not above using these techniques!)
Or the other idea I have thought of is a QR mount. I should be able to get an Omni on there, until my stoker kicks it off, or I lean the bike up somewhere...
I’ve got a set of moon comets (?) and the knockoff versions from PX that’s a few years old but have very adaptable mouthing. Just a rubber band wrap affair but the tilt is better than many I’ve had.
Otherwise I’ve had success padding out the stay/light with a small bit of wine cork or old inner tube at the top to help angle it more upright.